• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Search results

  1. AbbbbY

    Chemistry: Post your doubts here!

    Because it has a positive charge on top!
  2. AbbbbY

    Chemistry: Post your doubts here!

    The lonepair on Carbon is lost (from CH3-)
  3. AbbbbY

    Maths, Addmaths and Statistics: Post your doubts here!

    tan 45 = Perp / x So perp = xtan45 and MN = 2xtan45 Edit: You can simplify tan45 (or any other value should the need be). Tan 45 = 1 so MN = 2x. Is the answer? 2xTan45 and 2x both should be acceptable if I'm not mistaken.
  4. AbbbbY

    Chemistry: Post your doubts here!

    For the first question, we know CH3- is complete So, CH3+ has to be incomplete as it's losing 2 electrons. It didn't make sense when I first did it because I thought it was CH3- that was listed.
  5. AbbbbY

    Chemistry: Post your doubts here!

    Oh jeez. Contradiction in 4. I'll text my teacher and ask what the method was. 6- P = nRT/V => ((0.96/32)(8.31)(30+273))/7000 * 10^-6 =10791.1 Pa Hence, C I do know inorganic. Just haven't done organic.
  6. AbbbbY

    Chemistry: Post your doubts here!

    Inorganic and Physical, fire away!
  7. AbbbbY

    Chemistry: Post your doubts here!

    My bad. Typo. What sort of period table do you have? :p http://www.ptable.com/Images/periodic%20table.png
  8. AbbbbY

    Chemistry: Post your doubts here!

    I need the mols of Ba(NO3)2 to deduce how many mols of N2 will be produced. I didn't have a periodic table but I remember Ba and NO3 values having used them ample times so I simply plugged 137 and 62x2. You could also do 137+2(14+16+16+16) and it'd give you the same thing. (137+62+62 is the Mr...
  9. AbbbbY

    Maths, Addmaths and Statistics: Post your doubts here!

    There's ample of time in O Level Math. I did my entire paper with pencil first, rechecked, wrote it in pen and erased. I used to write the important steps only and do a two-three steps in one (ofcourse, without omitting the necessary stuff, if for example, I need the nature of the stationary...
  10. AbbbbY

    Maths, Addmaths and Statistics: Post your doubts here!

    Keep 4SF through out and round of only at the very end when giving the answer (to whatever he requires, 3sf or 3dp)
  11. AbbbbY

    Environmental Management

    I read the summaries of each of the four chapters, read three recent marking schemes for each P1 and P2 [lack of time!] and went in the exam hoping a case study on Pakistan shows up. Ended up getting Nigeria, lol, but everything you need to know is given there. Anyone with a decent knowledge...
  12. AbbbbY

    Maths, Addmaths and Statistics: Post your doubts here!

    This happens due to premature rounding off. The value difference between radians and degrees is way too much. Not a few decimals here and there.
  13. AbbbbY

    Chemistry: Post your doubts here!

    1- BF3 = Each F has 7 outer electrons Each B has 3 outer electrons So, B forms 3 bonds and hence has 6 electrons (incomplete octet!) CH3- Each C has 4 outer electrons Each H has one outer electron CH3 has an overall negative charge. So, C forms 3 bonds and will have 6 electrons. One electron...
  14. AbbbbY

    Chemistry: Post your doubts here!

    Enthalpy of formation is given for both the reactions. If the enthalpy of formation of individual products was given we'd have done that. Basically, they've already done the p-r and have given the value (+14 and -88 respectively)
  15. AbbbbY

    Chemistry: Post your doubts here!

    For P1, simple use ΔHf = ΔHp - ΔHr and ΔHc = ΔHr - ΔHp (I remember it from Crap. Crap = Cr-p. And thus, F is the other way round).
  16. AbbbbY

    Mathematics: Post your doubts here!

    x = 2*2^0.5 y= -2 Complex Numbers working is tough to show, so I'll simply tell you how it's to be done. Pretty easy question. Substitute w=x+iy in both sides and expand Then compare both sides (imaginary and real).
  17. AbbbbY

    Further Mathematics: Post your doubts here!

    Myself and a lot of my friends are struggling having studied it for about a year now. In all honesty, I don't think.
  18. AbbbbY

    Easiest O-Level Subjects

    From my personal experience, 1- Sociology 2- Environmental Management 3- Stats 4- Commerce. Super super short and easy. I did each in two weeks. (a few in less due to time constraints during my days)
  19. AbbbbY

    Chemistry: Post your doubts here!

    These three should cover AS and A2 energetics sufficiently. If you don't get it, let me know what you don't get and I'll explain.
  20. AbbbbY

    Chemistry: Post your doubts here!

    ΔHf = ΔHp - ΔHr You don't need the Hess Law for this. Since enthalpy of formation is formation of 1 mol from constituent elements (which is a two-step reaction in this case) So, ΔHf for 2ICl = +14, so ICl = +7 Add that to the second step you have your enthalpy change (In that, -88+7 =...
Top